Dyfyniad APA

SANDRA ALTERS. (1999). Biology: Understanding life. Sudbury, Massachusetts: John and Bartlett.

Dyfyniad Arddull Chicago

SANDRA ALTERS. Biology: Understanding Life. Sudbury, Massachusetts: John and Bartlett, 1999.

Dyfyniad MLA

SANDRA ALTERS. Biology: Understanding Life. Sudbury, Massachusetts: John and Bartlett, 1999.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.